Erasable four-color pen



FIG. 1 is a front, top and side perspective view of the erasable four-color pen embodying the design of the present invention;

FIG. 2 is a front end elevational view thereof;

FIG. 3 is a rear end elevational view thereof; and,

FIG. 4 is a side elevational view thereof, the side opposite and the top and bottom all being identical to the side shown in FIG. 4. 

The ornamental design for an erasable four-color pen, as shown and described. 